.head {
  height: 70px;
  line-height: 70px;
  background-color: var(--semi-color-fill-0);
  display: flex;
  min-width: 1200px;
  width: 100vw;
  position: fixed;
  left: 0;
  align-items: center;
}

.head a {
  display: inline-block;
  width: 200px;
  height: 70px;
}

.head a img {
  margin: 0 40px  0 20px;
}

.head button {
  min-width: 100px;
  height: 30px;
  border-radius: 6px;
  background-color: blue;
  color: white;
  text-align: center;
  line-height: 30px;
  position: relative;
  left: 480px;
}

.head ul {
  width: 500px;
  min-width: 700px;
}

.head ul li {
  float: left;
  list-style: none;
  margin-right: 30px;
}

.head ul li:nth-child(1) span {
  font-weight: 900;
}

.head ul li:hover span {
  color: blue;
  cursor: pointer;
}

.head ul li:nth-child(1):hover .wrap {
  transition: all 0.3s;
  width: 100vw;
  height: 300px;
  background-color: red;
  position: fixed;
  left: 0;
  top: 70px;
  z-index: 2147483647;
}

.head ul li:nth-child(2):hover .wrap {
  transition: all 0.3s;
  width: 70vw;
  height: 300px;
  background-color: red;
  position: fixed;
  left: 200px;
  top: 70px;
  z-index: 99;
}

.head ul li:nth-child(3):hover .wrap {
  transition: all 0.3s;
  width: 70vw;
  height: 500px;
  background-color: red;
  position: fixed;
  left: 200px;
  top: 70px;
  z-index: 99;
}

@keyframes myAdvan {
  0% {
    top: 40px;
  }
  100% {
    top: 30px;
  }
}

.advan {
  width: 300px;
  position: absolute;
  top: 30px;
  z-index: 10000;
  right: 10px;
  height: 40px;
  animation: myAdvan 1.5s infinite alternate  linear;
}
